Exhaust collar for a wood burning unit



FIG. 1 is a top, front perspective view of an exhaust collar for a wood burning unit showing my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a side elevation view thereof, the opposite side being a mirror image of that shown;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a front elevation view thereof, the opposite side being a mirror image of that shown. 

The ornamental design for a collar for a wood burning unit, as shown and described. 